Simplify accesses to Script::line_ends

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index f5c8693d50f248a2ebff0279cecfede4d496f9ac..53ce1eba0d13d07130f8d07d9a637edefb637542 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -13375,23 +13375,17 @@ void Script::InitLineEnds(Handle<Script> script) {
   Isolate* isolate = script->GetIsolate();
   if (!script->line_ends()->IsUndefined(isolate)) return;
 
-  if (!script->source()->IsString()) {
-    DCHECK(script->source()->IsUndefined(isolate));
-    Handle<FixedArray> empty = isolate->factory()->NewFixedArray(0);
-    script->set_line_ends(*empty);
-    DCHECK(script->line_ends()->IsFixedArray());
-    return;
-  }
-
-  Handle<String> src(String::cast(script->source()), isolate);
-
-  Handle<FixedArray> array = String::CalculateLineEnds(src, true);
-
-  if (*array != isolate->heap()->empty_fixed_array()) {
-    array->set_map(isolate->heap()->fixed_cow_array_map());
+  Object* src_obj = script->source();
+  if (!src_obj->IsString()) {
+    DCHECK(src_obj->IsUndefined(isolate));
+    script->set_line_ends(isolate->heap()->empty_fixed_array());
+  } else {
+    DCHECK(src_obj->IsString());
+    Handle<String> src(String::cast(src_obj), isolate);
+    Handle<FixedArray> array = String::CalculateLineEnds(src, true);
+    script->set_line_ends(*array);
   }
 
-  script->set_line_ends(*array);
   DCHECK(script->line_ends()->IsFixedArray());
 }